A frantic mother, brings her 2-week-old daughter to the casualty because of protracted vomiting. She states her baby has been vomiting for the last few days and was not tolerating any drinks or breast milk. The baby had been seen uncomfoable but had not been feverish. The course of her pregnancy was uneventful and she was vaginally delivered without any complications. On examination, the baby appears ill, but well developed. Her blood pressure is 50/30 mm Hg, pulse is 176/min, and respiratory rate is 35/min. Her oral mucosa look dry and she is not tearing much. Her anterior fontanelle appears sunken, and mild tenting can be elicited in her skin. An enlarged clitoris and paial fusion of the labial folds is noted. Serum electrolytes are significant for sodium of 123 mEq/L, chloride of 92 mEq/L, and bicarbonate of 27 mEq/L. Which of the following is the most common cause of ambiguous genitalia?

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